CN1989541A - Driving an electrophoretic display - Google Patents
Driving an electrophoretic display Download PDFInfo
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- CN1989541A CN1989541A CNA2005800252872A CN200580025287A CN1989541A CN 1989541 A CN1989541 A CN 1989541A CN A2005800252872 A CNA2005800252872 A CN A2005800252872A CN 200580025287 A CN200580025287 A CN 200580025287A CN 1989541 A CN1989541 A CN 1989541A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A driver (15, 10, 16) for an electrophoretic display (1) comprising pixels (18), comprises a controller (15) to select a particular drive waveform (Dij) for a particular one of the pixels (18) out of a particular set of drive waveforms (Si) being selected out of a plurality of sets of waveforms (So, ..., Si). A selection of the particular set of drive waveforms (Si) out of the plurality of sets of waveforms (So, ..., Si) is determined dependent on optical states of adjacent pixels (18) being adjacent to the particular one of the pixels (18) such that the crosstalk between the adjacent pixels (18) and the particular one of the pixels (18) is decreased. Each set of drive waveforms (Si) comprises drive waveforms (Dij) required to obtain optical states of the particular one of the pixels (18) suitable for a particular configuration of the optical states of the adjacent pixels (18). A selection of the particular drive waveform (Dij) from the particular set of drive waveforms (Di) is determined by a desired optical state of the particular one of the pixels (18). A pixel driver (10, 16) supplies the drive waveforms to the pixels (18).
Description
The present invention relates to be used for electrophoretic display device (EPD) driver, comprise this driver display panel, comprise the display device of this display panel and the method for drive cataphoresis display.
From International Patent Application WO 99/53373, can learn the display device of mentioning type in the introductory song.This patented claim discloses the electronic ink display (also being called the E-ink display in addition) that comprises two substrates.A substrate is transparent, and another substrate is equipped with the electrode of arranging with row and column.The point of crossing of display element or pixel and row and column electrode is got in touch.Each display element is coupled to the row electrode by the central electrode of thin film transistor (TFT) (also being called TFT in addition).The grid of TFT are coupled to column electrode.This layout of display element, TFT and row and column electrode have formed active matrix display device jointly.
Each pixel comprises pixel electrode, and described pixel electrode is the electrode that is connected to the pixel of row electrode by TFT.During image update or image refresh cycle, control line driver with select one by one display element all the row, and control row driver provide data-signal with selected row by row electrode and TFT and behavior display element.Data-signal is corresponding to the view data that will show on matrix display device.
In addition, provide electric ink being provided between public electrode on the transparent substrates and the pixel electrode.Therefore electric ink is clipped between public electrode and the pixel electrode.Electric ink comprises a plurality of about 10 to 50 microns microcapsules.Each microcapsules comprises positively charged white particle and the electronegative black particle that is suspended in the fluid.When pixel electrode is applied positive voltage, white particle moves to the side of microcapsules towards transparent substrates, and display element presents white for the observer.Simultaneously, black particle moves to the pixel electrode at microcapsules opposite side place, and black particle is hidden and does not allow the observer see herein.By pixel electrode is applied negative voltage, black particle moves to the public electrode of microcapsules towards transparent substrates one side, and display element presents black for the observer.When removing electric field, display device rests on the state that is obtained, and presents bistable behavior.Electronic ink display equipment with its black and white particle is particularly useful as e-book.
The quantity that moves to the particle of microcapsules top public electrode by control can be set up gray level in display device.For example, the long-pending plus or minus electric field energy that is defined as field intensity and application time has been controlled the amounts of particles that moves to the microcapsules top.
The inferior position of known display device is, the influence that it may be subjected to crosstalking between the pixel.
A target of the present invention is to reduce crosstalking between the pixel of electrophoretic display device (EPD).
A first aspect of the present invention provides a kind of driver that is used for electrophoretic display device (EPD) according to claim 1.A second aspect of the present invention provides a kind of display panel as claimed in claim 10.A third aspect of the present invention provides a kind of display device as claimed in claim 11.A fourth aspect of the present invention provides a kind of driving method as claimed in claim 12.Define advantageous embodiments in the dependent claims.
In prior art E-Ink display, crosstalk so and may become especially relevant if require to increase the response speed of electrophoretic display device (EPD), and also make voltage difference maximum on the electrophoretic particles as electrophoretic display device (EPD).In the display of the electrophoretic particles in based thin film (comprise capsule or such as the chamber of miniature cup), need be such as the extra play of adhesion layer and bonding coat to be used for structure.Between electrode, they cause pressure drop and have therefore reduced the voltage on the particle these layers usually equally.For increasing response speed, therefore possible is the conductance that increases these layers.Yet this may cause in electrophoretic display device (EPD) crosstalks, and this is because the electric field part relevant with specific pixel by mistake diffuses to adjacent pixels.This electric field has partly changed the optical states of these pixels, and itself and predetermined optical state are departed from.Be positioned near another not driven pixel if be urged to the pixel of one of them ultimate value optical states, then this situation is extremely remarkable.If adopt the spatial jitter technology to realize additional gray scale levels, will usually meet with this situation so, described spatial jitter technology has been used the inspection panel of the similar pattern that black and white pixel wherein replaces.
The driver that is used for electrophoretic display device (EPD) according to first aspect present invention comprises controller, and described controller is used for selecting specific drive waveforms from particular set of drive waveforms for specific pixel.This particular set of drive waveforms is selected from a plurality of sets of waveforms.From many groups waveform, select this particular set of drive waveforms and depend on optical states with described specific pixel adjacent pixels.This selection is such reduction of crosstalking that makes between neighbor and the specific pixel.Each set of drive waveforms includes and obtains the required and drive waveforms that be suitable for the ad hoc structure of neighbor optical states of specific pixel optical states.Difference for the neighbor optical states may structure can be found out required drive waveforms by test method.From particular set of drive waveforms, select specific drive waveforms to determine by the desired optical states of the specific pixel in the pixel.Pixel driver provides drive waveforms for pixel.
Therefore, the driving that changes pixel by the quantity that increases set of drive waveforms reduces and crosstalks.Now also comprise such group, described group of (image update) drive waveforms that includes the different structure of having considered the neighbor optical states.The optimal drive waveform of the specific pixel that is centered on by neighbor based on detected structure choice.
In embodiment according to claim 2, pixel driver comprises: storer, to store previous image; And comparer, with the optical transition that the previous image with present image and storage compares and then definite expectation pixel is carried out.Now, optical states is optical transition.If the optical states of pixel depends on the optical transition that will carry out such as the E-Ink electrophoretic display device (EPD), this method is especially relevant so.
In embodiment according to claim 3, each set of drive waveforms comprises that the institute that the covering pixel can be carried out might needed all drive waveforms of optical transition.For example, if pixel has four kinds of optical states, have 16 kinds of possible optical transition so, so set of drive waveforms can comprise 16 kinds of different drive waveforms.If identical waveform can be used for different optical states, then described set of drive waveforms can comprise and is less than 16 kinds different wave.Described four kinds of optical states can be for example white, light grey, Dark grey and black.
In embodiment according to claim 4, the optical transition of expecting is stored in the storer.In known electrophoretic display device (EPD) based on E-Ink, the comparative result of previous optical states of pixel and new optical states directly causes required drive waveforms.Therefore, when every capable information is carried out addressing, repeat initial optical state and unique simply and fast the calculating of limiting of final optical states, and before driving pixel, select appropriate waveform by pixel.Limiting appropriate waveform in the present invention may be complicated more, and this is because the qualification of appropriate waveform is depended on the quantity of sets of waveforms and selected the employed standard of appropriate sets of waveforms.Because described calculating may be very consuming time, therefore in a preferred embodiment, controller is stored in the result of described comparison in the storer.Now, before beginning, image update only needs more once.The address period of the information of being expert at retrieves the data that are stored in the storer to select appropriate drive waveforms.
In embodiment according to claim 5, the drive waveforms difference of the drive waveforms of extra set of drive waveforms and already present set of drive waveforms is to have revised data division or driving pulse.Already present set of drive waveforms is if the set of drive waveforms of crosstalking and needing when not offsetting.In phase different wave on the same group, the relative timing of data division (time location) can be different.This has covered has a mind to identical pulse is postponed in time but does not change the selection of level or amplitude.The pulse of this delay also can be used for offsetting crosstalks.
In embodiment according to claim 6, described specific drive waveforms also comprises reset pulse.
In embodiment according to claim 7, described specific drive waveforms also comprises reset pulse, and described reset pulse has the duration and/or the level of the optical states that depends on neighbor.
In embodiment according to claim 8, described specific drive waveforms also comprises shake pulse (shaking pulse).
In embodiment according to claim 9, described drive waveforms also comprises the first shake pulse, reset pulse, second shake pulse and the driving pulse.
Be called the patented claim (submitting to as european patent application 02077017.8 and 03100133.2) of applicant's file of PHNL 020441 and PHNL 030091 from basis, what know is to be also referred to as the prepulsing of shaking pulse by use image retention is minimized.Preferably, the shake pulse comprises a series of AC pulses, yet described shake pulse can comprise only monopulse.Present patent application is intended to shake the use of pulse, or directly before driving pulse, perhaps directly before reset pulse, perhaps before both.
From embodiment described below, these and other aspects of the present invention will be apparent, and will set forth these and other aspects of the present invention with reference to the embodiments described below.
Among the figure:
Fig. 1 shows the part xsect of electrophoretic display devices;
Fig. 2 shows the display device of the equivalent circuit diagram with electrophoretic display devices part;
Fig. 3 A-3H shows the drive waveforms that has crosstalk compensation and do not have crosstalk compensation.
Fig. 1 shows the part xsect of electrophoretic display devices 1, and described electrophoretic display devices 1 for example has several display element sizes.Electrophoretic display devices 1 comprises substrate 2 and has the electrophoretic film of electric ink, and described electric ink is present between two transparent substrates 3 and 4, and described transparent substrates for example is a tygon.One of them substrate 3 is equipped with transparent picture electrode (picture electrode) 5,5 ', and another substrate 4 is equipped with transparent counter electrode 6.Described electric ink comprises about 10 to 50 microns a plurality of microcapsules 7.Described microcapsules 7 are spherical form not necessarily, may be other shapes, for example rectangle in the highest flight.Each microcapsules 7 comprises positively charged black particle 8 and the electronegative white particle 9 that is suspended in the fluid 40.Dashed material 41 is polymeric binders.Particle 8 and 9 can have other colors except black and white.Only importantly, two types particle 8 and 9 has different optical properties and different electric charges, makes its action difference for applying electric field.Layer 3 not necessarily, perhaps layer 3 can be a cementing layer.When applying negative voltage as 5 pairs of counter electrodes 6 of electrode, produce such electric field, described electric field makes black particle 8 move to the side of microcapsules 7 towards counter electrode 6, display element will present black for the observer.Simultaneously, white particle 9 moves to the opposite side of microcapsules 7, with respect to the observer white particle 9 is stashed herein.By applying positive electric field at counter electrode 6 with between as electrode 5, white particle 9 moves to the side of microcapsules 7 towards counter electrode 6, and display element presents white (not shown) with respect to the observer.When removing electric field, particle 7 rests on acquired state, and display presents bistable behavior and consumed power not substantially.
Fig. 2 shows the equivalent electrical circuit of image display 1, and described image display 1 comprises the electrophoretic film that is laminated on the substrate 2, and described substrate is equipped with source switch element 19, line driver 16 and row driver 10.Preferably, described counter electrode 6 is provided on the film that includes encapsulated electrophoretic ink, if still display is based on the work of the face of use internal electric field, then counter electrode 6 can be used as to substitute and is provided on the substrate.Display device 1 is by the active switch element drives, and described active switch element for example can be a thin film transistor (TFT) 19.Display device 1 comprises the display component array that is positioned at row or selection electrode 17 and row or place, data electrode 11 intersection regions.Described line driver 16 select progressively column electrodes 17, row driver 10 provides data-signal for the row electrode 11 that is used for selected column electrode 17 simultaneously.Preferably, processor 15 at first is processed into the data-signal that provides by row electrode 11 with data 13 on the horizon.
Mutual synchronous signal between control line 12 and 12 ' carrying control row driver 10 and the line driver 16.Selection signal from line driver 16 (being electrically connected to column electrode 17) is selected pixel electrode 22 by the gate electrode 20 of thin film transistor (TFT) 19.The source electrode 21 of described thin film transistor (TFT) 19 is electrically connected to row electrode 11.The data-signal that row electrode 11 places exist is transferred into the pixel electrode 22 of display element 18 (being also referred to as pixel), and described display element 18 is coupled with the drain electrode of thin film transistor (TFT).In the illustrated embodiment, the display device of Fig. 1 also is included in the optional capacitor 23 of each display element 18 position.This optional capacitor 23 is connected between the pixel electrode 22 and one or more storage capacitor line 24 of related pixel 18.Also can use other on-off elements and replace TFT, such as diode, MIM etc.
Processor 15 can comprise storer 150, comparer 151, controller 153 and storer 152.Storer 150 is stored the previous image of data 13 at hand.Comparer 151 present image of data 13 at hand compares with the previous image of being stored, with the optical transition of determining that expectation pixel 18 is carried out.Controller 153 checks for each pixel 18 what the optical transition of neighbor 18 is.Neighbor 18 can be all pixels 18 or its subclass with specific pixel 18 direct neighbors.For example, neighbor 18 can be the neighbor in going together mutually, and the perhaps neighbor 18 in colleague's (17) and same column (11) mutually is perhaps at the neighbor of specific pixel corner.According to the optical transition that will be undertaken by specific pixel 18, from drive waveforms Dij group Si, select to be suitable for the drive waveforms Dij of specific pixel 18, described drive waveforms Dij group Si belongs to the determined pattern of optical transition of neighbor 18.Therefore, different drive waveforms Dij organize the different pattern that Si can be used for the optical transition of neighbor 18.Among these groups Si each all comprises the possible required waveform of optical transition of the institute that obtains specific pixel 18, required waveform has been noted the pattern of the optical transition of neighbor 18, makes because the cross talk effects to specific pixel 18 that the optical transition of neighbor 18 causes reduces or is compensated.This point will be set forth with reference to the example shown in the figure 3.Different drive waveforms Dij or its are with reference to being stored in the storer 152.If all drive waveforms Dij that need are stored in the storer, controller 153 can be retrieved the suitable drive waveforms Dij that the specific pixel 18 required optical transition of sening as an envoy to are suitable for the current pattern of neighbor 18 optical transition simply so.Otherwise controller 153 uses the reference of drive waveforms to produce appropriate drive waveforms Dij.
In the display device that comprises display panel 1, there is the image processing circuit 25 of receiving input data signal IV, think that processor 15 provides the conduct image of data 13 at hand.Described data at hand 13 have been determined the optical transition that pixel 18 will be carried out.
Fig. 3 A-3H shows the drive waveforms that has crosstalk compensation and do not have crosstalk compensation.On the left side is the example of (for example when all neighbors have the optical transition identical with center pixel) employed standard drive waveform when if Fig. 3 A-3D shows optical transition when compensation of not carrying out neighbor 18 or do not need this compensation.
Known electrophoretic display device (EPD) drives and only uses single set of drive waveforms So, and for each optical transition that will be undertaken by specific pixel 18, described single set of drive waveforms So comprises identical drive waveforms Doj.In the example shown in Fig. 3 A to 3D, only show four waveforms among n the drive waveforms Do1 to Don (total also be called Doj), described four waveforms are used for four kinds of conversions of n kind optical transition.Shown in drive waveforms be respectively: be used for Do1, be used for Do2, be used for from black B to the Doj of white W optical transition and be used for Don from white W to white W optical transition from black B to black B optical transition from white W to black B optical transition.
For example from above mentioned european patent application, be widely known by the people owing to describe in detail, therefore known drive waveforms only done concise and to the point elaboration.In all drive waveforms Do1 to Don, shake pulse SP1 comprises the pulse of a series of time alignments with alter polarity.Same at all drive waveforms Do1 to Don, also existence is shaken pulse SP2 and also is time alignment.Yet shake pulse SP1 and/or SP2 do not need time alignment.In addition, if do not need level to change, then do not need to exist shake pulse SP1, SP2.In waveform Do1, reset pulse RP has positive polarity makes all positive black particles 9 move to the top of microcapsules 7, and pixel electrode 18 presents black, and the optical states B that reaches expectation does not need driving pulse DP.In waveform Do2, do not need optical transition, therefore do not need to reset, although can preferably apply the positive polarity reset pulse to stop the adhesion of particle 8 and 9 to lack duration and/or low amplitude value.In waveform Doj, reset pulse RP has negative polarity, and all negative white particles are moved to the top of microcapsules 7, pixel 18 presents white, and the optical states white W that reaches expectation no longer needs driving pulse DP.In waveform Don, do not need optical transition, therefore do not need to reset, although can apply the negative polarity reset pulse.If must show intermediate grey scales, then need non-zero driving pulse DP with from by white that applies the accurate definition that reset pulse RP reaches or the optical states that black state changes pixel 18.
Have other colors as fruit granule, will other optical transition take place.May there be other optical states, such as, light gray and Dark grey.If possible have optical state black B, there are 16 kinds of possible optical transition so in Dark grey, light gray and white W, and every kind of optical transition has corresponding driving waveform Do1 to Don, wherein n=16.Not being all waveforms must be different.This known method is not noted by the crosstalking of introducing with the optical transition of specific pixel 18 adjacent pixels 18.Therefore, drive waveforms Doj group So is also referred to as standard set of drive waveforms.
Only by example, the reference waveform Doj shown in Fig. 3 A to 3D with shown in order comprise: the first shake pulse SP1, reset pulse RP, second shake pulse SP2 and the driving pulse DP.For shown in four kinds of optical transition, driving pulse DP has null.Shake pulse SP1 and SP2 have reduced the inertia of particle 8 and 9, make them have response faster for reset pulse RP and driving pulse DP.By the ultimate limit state (black B and white W) of at first optical states of pixel 18 being changed into explication, reset pulse RP has improved the repeatability of the optical states of pixel 18.Yet shake one of pulse SP1 and SP2 or two and/or reset pulse RP do not need to exist.
For every kind of neighbor 18 possible pattern of optical transitions, might determine to crosstalk how for the influence of specific pixel 18.Can change reference waveform then and crosstalk, make this crosstalk and reduce or compensated to be fit to this.Fig. 3 E to 3H shows the drive waveforms Dij group Si of a change.If the optical states that the optical transition of neighbor 18 causes specific pixel 18 for crosstalk (total amount) of specific pixel 18 then needs this drive waveforms Dij group towards white shift.If most neighbors 18 have the optical transition from black to white, this white shift then takes place.For the optical transition from black to white, need negative resetting and/or driving voltage.Because the part of crosstalking of this negative voltage will be applied on the specific pixel 18, therefore will cause white shift.
Fig. 3 E shows and obtains from white W to the needed drive waveforms Di1 of black B optical transition.This drive waveforms Di1 is identical with the drive waveforms Do1 shown in Fig. 3 A.Because reset pulse RP has overcome the crosstalk components that the reset pulse RP by neighbor 18 causes, so specific pixel is reset to black B.
Fig. 3 F shows the drive waveforms Di2 based on drive waveforms Do2.In this example, owing to crosstalking that the shortage of the reset pulse of the negative reset pulse RP of neighbor 18 and specific pixel 18 causes, so white shift takes place.Compensate this white shift by positive driving pulse DP.The driving pulse DP of the drive waveforms Di2 that changes may conflict fully on position (moment that drive waveforms occurs) with the driving pulse DP (not shown) of the standard drive waveform of black B in the middle of the gray level and white W optical transition or part is conflicted.The driving pulse DP of the drive waveforms Di2 that changes also may be before the position of the driving pulse DP of described standard drive waveform or afterwards.The duration and/or the amplitude that also may change reset pulse replace changing or adding driving pulse DP, thereby make the influence of crosstalking reduce.
Fig. 3 G shows the required drive waveforms Dij of optical transition that obtains from black B to white W.This drive waveforms Dij is identical with the drive waveforms Doj of Fig. 3 C.Because reset pulse RP, overcome the crosstalk components that the reset pulse RP by neighbor 18 causes, so specific pixel 18 is reset to white W.In any case crosstalking only to cause skew to white, but whiter than white is impossible.
Fig. 3 H shows the drive waveforms Din based on drive waveforms Don.In this example, owing to the negative reset pulse RP of neighbor 18 and crosstalking of being used for that the shortage of the reset pulse RP of specific pixel 18 causes, white shift takes place.Since can not be whiter than white, therefore do not need white shift is compensated.
Yet, also black shift may take place.If most neighbors 18 have the optical transition from white to black, black shift then takes place.For the optical transition from white to black, need positive resetting and/or driving voltage.Owing to crosstalk, this positive voltage part will be applied on the specific pixel 18, therefore will cause black shift.Optical transition is feasible introduces specific pixel with black shift if neighbor has, and then can compensate this black shift by introduce positive driving pulse DP (being represented by dotted line) in waveform Din.Because the structure difference of the optical transition of neighbor, the waveform after belongs to another sets of waveforms.
Therefore, crosstalk, rather than use single drive waveforms Doj group So by using several drive waveforms Dij group So to Si to reduce.To cause particular crosstalk in specific pixel 18, this depends on the structure of the optical transition of neighbor 18.Reduce by the drive waveforms of from the sets of waveforms of the practical structures that is suitable for neighbor 18 optical transition, selecting to be used for the required optical transition of specific pixel and to crosstalk.
In a word, can followingly operate according to electrophoretic display device (EPD) of the present invention:
(i), the picture material of present image and new images is stored in the storer of control electronic equipment as in the prior art electrophoretic display device (EPD).
(ii) the content to two images compares, and not only determines the initial and end-state (as in the prior art) of specific pixel 18 by this, and has determined the character around the specific pixel 18.Usually, the pixel environment of new images is most important for the influence of determining to crosstalk.
(iii) when comparing, the control electronic equipment will call one of a series of drive waveforms Dij, so that specific pixel 18 is switched to new optical states from previous optical states.The waveform of described selection depends on the optical states (especially in the new images) or the optical transition of the surrounding pixel 18 around the specific pixel 18.Usually, must know that also the original state of specific pixel 18 is to select appropriate waveform.
In the example of the display with 4 gray levels, each drive waveforms Dij group Si can comprise that 16 kinds of different drive waveforms Dij might change with the institute that covers from a gray level to another gray level.For example, can generate not Si on the same group for following arbitrary situation.The neighbor 18 of specific pixel 18 all has identical optical transition.At least one has the optical transition different with specific pixel 18 in the neighbor 18.Most neighbors 18 have the optical transition different with specific pixel 18.All neighbors 18 have the optical transition different with specific pixel 18.In addition, described group of Si can extend to and comprise not on the same group, the described position of not depending on neighbor optical transition polarity on the same group, having the neighbor of changing with specific pixel 18 different optical 18, and perhaps whether specific pixel 18 is positioned at the edge of demonstration.
Should be noted in the discussion above that the foregoing description has illustrated rather than limited the present invention, and under the situation that does not depart from appended claims scope of the present invention, those skilled in the art can design many alternative embodiment.To the present invention, electrophoretic display device (EPD) is that the E-Ink display is not an essence.The present invention for any wherein particle since apply electric field and other mobile electrophoretic display device (EPD)s also are useful.
In claims, being placed on that any Reference numeral in the bracket should not be construed as is limitation of the present invention.Verb " comprises " and the use of this verb changing form is not got rid of in claim to be stated those elements or the element the step or the existence of step.The element front be used to the existence that speech " " or " " do not get rid of a plurality of this elements.The present invention can be by comprising several different elements hardware and implemented by the computing machine of suitable programming.In having enumerated the equipment claim of several instruments, several these instruments can be implemented with identical item of hardware by one.The simple fact is, the certain measures of enumerating jointly in different dependent claims does not represent that the combination of these measures can not advantageously use.
Claims (12)
1. driver (15,10,16) that is used to comprise the electrophoretic display device (EPD) (1) of pixel (18), described driver (15,10,16) comprising:
Controller (15), be used to specific pixel in the pixel (18) from by a plurality of sets of waveforms (So, ..., Si) select specific drive waveforms (Dij) in the particular set of drive waveforms of selecting in (Si), by a plurality of sets of waveforms (So, ..., Si) select particular set of drive waveforms (Si) in and be according to described pixel (18) in the optical states of the adjacent neighbor (18) of specific pixel determine, to reduce crosstalking between the specific pixel in neighbor (18) and the described pixel (18), described each set of drive waveforms (Si) comprises the required drive waveforms (Dij) of optical states that obtains the specific pixel in the described pixel (18), described drive waveforms is suitable for the ad hoc structure of neighbor (18) optical states, from particular set of drive waveforms (Di), select specific drive waveforms (Dij) determine by the expectation optical states of the specific pixel in the pixel (18) and
Pixel driver (10,16) is used to pixel (18) that drive waveforms is provided.
2. driver according to claim 1 (15,10,16) also comprises:
Storer (150) is used to store previous image,
Comparer (151) be used for present image and previous image are compared the optical transition of expecting that to determine pixel (18) is carried out, and wherein said optical states is an optical transition.
3. driver according to claim 1 (15,10,16), wherein each set of drive waveforms (Di) comprises and covers the possible required drive waveforms (Dij) of optical transition of institute.
4. driver according to claim 2 (15,10,16) also comprises: another storer (152) is used to store the reference that obtains expecting the required waveform of optical transition (Dij).
5. driver (15 according to claim 1,10,16), wherein arrange described pixel driver (10,16), be used to provide the specific drive waveforms that comprises data division (DP) (Dij), described data division (DP) has various durations and/or level and/or the relative timing of depending on neighbor (18) optical states.
6. driver according to claim 5 (15,10,16) wherein pixel driver (10,16) is provided be used to provide the specific drive waveforms that comprises reset pulse (RP) (Dij).
7. driver (15 according to claim 1,10,16), wherein with pixel driver (10,16) be arranged to be used to provide the specific drive waveforms that comprises reset pulse (RP) (Dij), described reset pulse to have various durations and/or the level and/or the relative timing of the optical states that depends on neighbor (18).
8. according to claim 5,6 or 7 each described drivers (15,10,16), wherein pixel driver (10,16) is arranged to be used to provide also comprise shake pulse (SP1; SP2) specific drive waveforms (Dij).
9. driver (15 according to claim 6,10,16), wherein with pixel driver (10,16) be arranged to be used to provide drive waveforms (Dij), described drive waveforms to comprise the first shake pulse (SP1), reset pulse (RP), the second shake pulse (SP2) successively and as the driving pulse of data division (DP).
10. display panel that comprises driver according to claim 1 (15,10,16) and electrophoretic display device (EPD) (1).
11. a display device comprises display panel according to claim 10 and image processing circuit (25), described image processing circuit is used for receiving input data (IV) and thinks that the driver (15,10,16) of determining optical transition provides image (13).
12. a driving comprises the method for the electrophoretic display device (EPD) of pixel (18), described method comprises:
From by a plurality of sets of waveforms (So, ..., Si) select (15) specific drive waveforms (Dij) for the specific pixel in the pixel (18) in the particular set of drive waveforms of selecting in (Si), by a plurality of sets of waveforms (So, ..., Si) select in particular set of drive waveforms (Si) depend on described pixel (18) in the optical states of the adjacent neighbor (18) of specific pixel, to reduce crosstalking between the specific pixel in neighbor (18) and the described pixel (18), each set of drive waveforms (Si) comprises the required drive waveforms (Dij) of optical states that obtains the specific pixel in the described pixel (18), described drive waveforms is suitable for the ad hoc structure of neighbor (18) optical states, from particular set of drive waveforms (Di), select specific drive waveforms (Dij) determine by the expectation optical states of the specific pixel in the pixel (18) and
For pixel (18) provides (10,16) drive waveforms (Dij).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04103582 | 2004-07-27 | ||
| EP04103582.5 | 2004-07-27 |
Publications (1)
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| CN1989541A true CN1989541A (en) | 2007-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800252872A Pending CN1989541A (en) | 2004-07-27 | 2005-07-20 | Driving an electrophoretic display |
Country Status (7)
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| US (1) | US20080094315A1 (en) |
| EP (1) | EP1774502A1 (en) |
| JP (1) | JP2008508549A (en) |
| KR (1) | KR20070048704A (en) |
| CN (1) | CN1989541A (en) |
| TW (1) | TW200620215A (en) |
| WO (1) | WO2006013506A1 (en) |
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| CN106548754A (en) * | 2015-09-17 | 2017-03-29 | 达意科技股份有限公司 | Color electrophoresis display device and its display drive method |
| TWI611392B (en) * | 2015-09-17 | 2018-01-11 | 達意科技股份有限公司 | Color electrophoretic display apparatus and a display driving method thereof |
| CN111048046A (en) * | 2019-12-04 | 2020-04-21 | 广州奥翼电子科技股份有限公司 | Driving method of double-color electrophoretic display |
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| JP5207686B2 (en) * | 2007-08-22 | 2013-06-12 | シチズンホールディングス株式会社 | Display device |
| JP5019177B2 (en) * | 2007-10-16 | 2012-09-05 | セイコーエプソン株式会社 | Electrophoretic display device, electronic apparatus, and driving method of electrophoretic display device |
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| JP5343640B2 (en) * | 2009-03-11 | 2013-11-13 | セイコーエプソン株式会社 | Electrophoretic display device and electronic apparatus |
| KR101289640B1 (en) * | 2008-12-03 | 2013-07-30 | 엘지디스플레이 주식회사 | Electrophoresis display |
| TWI409767B (en) * | 2010-03-12 | 2013-09-21 | Sipix Technology Inc | Driving method of electrophoretic display |
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| JP5919639B2 (en) * | 2011-04-15 | 2016-05-18 | セイコーエプソン株式会社 | Control method for electrophoretic display device, control device for electrophoretic display device, electrophoretic display device, and electronic apparatus |
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- 2005-07-20 US US11/572,573 patent/US20080094315A1/en not_active Abandoned
- 2005-07-20 EP EP05772265A patent/EP1774502A1/en not_active Withdrawn
- 2005-07-20 KR KR1020077001921A patent/KR20070048704A/en not_active Application Discontinuation
- 2005-07-20 JP JP2007523207A patent/JP2008508549A/en active Pending
- 2005-07-20 WO PCT/IB2005/052424 patent/WO2006013506A1/en not_active Application Discontinuation
- 2005-07-20 CN CNA2005800252872A patent/CN1989541A/en active Pending
- 2005-07-22 TW TW094124987A patent/TW200620215A/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106548754A (en) * | 2015-09-17 | 2017-03-29 | 达意科技股份有限公司 | Color electrophoresis display device and its display drive method |
| TWI611392B (en) * | 2015-09-17 | 2018-01-11 | 達意科技股份有限公司 | Color electrophoretic display apparatus and a display driving method thereof |
| US9972254B2 (en) | 2015-09-17 | 2018-05-15 | E Ink Holdings Inc. | Color electrophoretic display apparatus and a display driving method thereof |
| CN106548754B (en) * | 2015-09-17 | 2019-03-19 | 元太科技工业股份有限公司 | Color electrophoresis display device and its display driving method |
| CN111048046A (en) * | 2019-12-04 | 2020-04-21 | 广州奥翼电子科技股份有限公司 | Driving method of double-color electrophoretic display |
| CN111048046B (en) * | 2019-12-04 | 2021-01-15 | 广州奥翼电子科技股份有限公司 | Driving method of double-color electrophoretic display |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1774502A1 (en) | 2007-04-18 |
| JP2008508549A (en) | 2008-03-21 |
| WO2006013506A1 (en) | 2006-02-09 |
| US20080094315A1 (en) | 2008-04-24 |
| KR20070048704A (en) | 2007-05-09 |
| TW200620215A (en) | 2006-06-16 |
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